Hello, how nice you re interactive. This seems to be a great resource. I just did a usual wikapedia search for the following question: Can nicotine use cause a change in color of stool? I was a non-smoker for 10 months and started vaping 10 days ago, with nicotine, and my stool, while not quite black, is very dark now.Any info would be appreciated, Best, Shawn James (Toronto)